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Composite solvent and method for extracting and separating aromatics and alkanes in diesel fraction

A composite solvent and extraction solvent technology, which is applied in the treatment of hydrocarbon oil, petroleum industry, refined hydrocarbon oil, etc., can solve the problems of poor selectivity, difficult separation, high operating conditions, etc., and achieve the effect of improving the effect and quality

Active Publication Date: 2020-05-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In the existing methods for solvent extraction and upgrading of diesel oil, solvents for the extraction of aromatics from gasoline fractions are mostly used, such as sulfolane, NMP, etc. Although these solvents can separate aromatics in diesel, they also have poor selectivity. The defect of high alkane content, and if the content of aromatics in the diesel fraction is high, the solvent will be miscible with the original, and it is difficult to separate
In addition, the use of the above-mentioned solvents has poor thermal stability and chemical stability, and side reactions such as decomposition and oxidation are prone to occur, and the requirements for operating conditions are relatively high.
In addition, there will be a certain amount of residue in the obtained product, which will affect the sulfur and nitrogen content of the oil and other indicators

Method used

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  • Composite solvent and method for extracting and separating aromatics and alkanes in diesel fraction
  • Composite solvent and method for extracting and separating aromatics and alkanes in diesel fraction
  • Composite solvent and method for extracting and separating aromatics and alkanes in diesel fraction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] This example illustrates the evaluation of the selectivity coefficient of the extraction solvents of the present invention.

[0056] With 1-n-heptyl-3-methylimidazolium hexafluorophosphate (hereinafter abbreviated as IL1, [HMIM]PF 6 , the same below) as the main solvent, 1-n-heptyl-3-methylimidazolium tetrafluoroborate (IL2, [HMIM] BF 4 ) as a co-solvent, the compound solvent (IL1+IL2) was prepared in a mass ratio of 70:30.

[0057] The composite solvent and simulated diesel oil A were mixed according to the agent / oil mass ratio of 3:1, and a single extraction was carried out under stirring. The extraction temperature was 50°C, the extraction pressure was 0.1MPa, and the extraction stirring time was 30min.

[0058] Analyze the composition of the raffinate oil and the extracted oil, and calculate the selectivity of the solvent to tetrahydronaphthalene. The extraction results are shown in Table 2.

Embodiment 2

[0073] This example illustrates the evaluation of the selectivity coefficient of the extraction solvents of the present invention.

[0074] With N-heptyl-4-methylpyridine hexafluorophosphate (IL3, [HMPy]PF 6 ) as the main solvent, N-heptyl-4-picoline tetrafluoroborate (IL4, [HMPy] BF 4 ) as a co-solvent, the compound solvent (IL3+IL4) was prepared in a mass ratio of 60:40.

[0075] The composite solvent and simulated diesel oil B were mixed according to the agent / oil mass ratio of 2:1, and a single extraction was carried out under stirring. The extraction temperature was 90°C, the extraction pressure was 0.1MPa, and the extraction stirring time was 30 minutes.

[0076] Analyze the composition of the raffinate oil and the extracted oil, and calculate the selectivity of the solvent to 1-methylnaphthalene. The extraction results are shown in Table 3.

Embodiment 3

[0086] This example illustrates that the extraction solvent of the present invention extracts and separates diesel fractions.

[0087] With IL3([HMPy]PF 6 ) as the main solvent, N-heptyl-4-picoline bistrifluoromethylsulfonimide salt (IL5, [HMPy]NTF 2 ) as a co-solvent, the compound solvent (IL3+IL5) was prepared in a mass ratio of 70:30.

[0088] according to figure 1 The process is to extract the raw diesel C with a composite solvent. The operating conditions of the extraction tower, stripping tower and vacuum distillation tower during the extraction process are shown in Table 4, and the extraction results are shown in Table 5.

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Abstract

The invention belongs to the field of extraction and separation of aromatic hydrocarbons from diesel oil fractions, and discloses a composite solvent and a method used for extracting and separating aromatic hydrocarbons and alkanes in diesel oil. The composite solvent comprises, by weight, 60 to 99% of a main solvent A and 1 to 40% of a cosolvent B; the cations in the main solvent A and the cosolvent B are the same, and are selected from alkyl substituted imidazole or pyridine cations; the anions in the main solvent A and the cosolvent B are different, and are selected from hexafluorophosphate, tetrafluoroborate, ditrifluoromethyl sulfonylate. The composite solvent is capable of realizing effective separation of aromatic hydrocarbons in diesel oil effectively, and improving the property ofdiesel oil products.

Description

technical field [0001] The invention relates to the field of extraction and separation of aromatics in diesel fractions, in particular to a composite solvent and method for extracting and separating aromatics and alkanes in diesel fractions. Background technique [0002] Under the general situation of developing a low-carbon economy and realizing sustainable development, the pace of oil product quality upgrading has been significantly accelerated. The new environmental protection regulations on the control of vehicle exhaust emissions have higher and higher requirements for diesel quality, especially for the aromatics content in diesel. And cetane number requirements are becoming more and more stringent. [0003] The amount of secondary processed catalytic diesel (LCO), coking diesel, and hydrocracked diesel in China is relatively large, and secondary processed diesel accounts for about 50% of the diesel pool, of which LCO accounts for about 30% of the diesel pool. The cont...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D233/58
CPCC10G21/20C10G21/27C10G2300/307C10G2400/04
Inventor 史军军葸雷吴巍果卉朱宁
Owner CHINA PETROLEUM & CHEM CORP